note 11313 added to ImageCopyResized

Here is my addition to imagecopyresized it implements bicubic interpolation of pixels so the result is much better than the ordinary imagecopyresized ... copy it into the src/ext/gd/gc.c and recompile the lib. i wish someone could do that so it's included in the "official" release it's a really good function to scale down pictures to thumbnails. /* {{{ proto int imagecopyresizedbicubic(int dst_im, int src_im, int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h) Copy and resize part of an image */ PHP_FUNCTION(imagecopyresizedbicubic) { zval **SIM, **DIM, **SX, **SY, **SW, **SH, **DX, **DY, **DW, **DH; gdImagePtr im_dst, im_src; int srcH, srcW, dstH, dstW, srcY, srcX, dstY, dstX; int i, j; int r, g, b, c1,c2,c3,c4,color; float sX, sY; float scaleX,scaleY,scaleX2,scaleY2; GDLS_FETCH(); if (ZEND_NUM_ARGS() != 10 || zend_get_parameters_ex(10, &DIM, &SIM, &DX, &DY, &SX, &SY, &DW, &DH, &SW, &SH) == FAILURE) { WRONG_PARAM_COUNT; } ZEND_FETCH_RESOURCE(im_dst, gdImagePtr, DIM, -1, "Image", le_gd); ZEND_FETCH_RESOURCE(im_src, gdImagePtr, SIM, -1, "Image", le_gd); convert_to_long_ex(SX); convert_to_long_ex(SY); convert_to_long_ex(SW); convert_to_long_ex(SH); convert_to_long_ex(DX); convert_to_long_ex(DY); convert_to_long_ex(DW); convert_to_long_ex(DH); srcX = Z_LVAL_PP(SX); srcY = Z_LVAL_PP(SY); srcH = Z_LVAL_PP(SH); srcW = Z_LVAL_PP(SW); dstX = Z_LVAL_PP(DX); dstY = Z_LVAL_PP(DY); dstH = Z_LVAL_PP(DH); dstW = Z_LVAL_PP(DW); // kopiera paletten for( i=0; i<256; i++ ) { gdImageColorAllocate( im_dst, im_src->red[i], im_src->green[i], im_src->blue[i] ); }; // gdImageCopyResized(im_dst, im_src, dstX, dstY, srcX, srcY, dstW, dstH, srcW, srcH); scaleX = (float)(srcW-1) / (float)dstW; scaleY = (float)(srcH-1) / (float)dstH; scaleX2 = scaleX/2.0f; scaleY2 = scaleY/2.0f; for( j=0; j<dstH; j++ ) { for( i=0; i<dstW; i++ ) { sX = (float)i * scaleX; sY = (float)j * scaleY; c1 = gdImageGetPixel(im_src, (int)(sX), (int)(sY+scaleY2) ); c2 = gdImageGetPixel(im_src, (int)(sX), (int)(sY) ); c3 = gdImageGetPixel(im_src, (int)(sX+scaleX2), (int)(sY+scaleY2) ); c4 = gdImageGetPixel(im_src, (int)(sX+scaleX2), (int)(sY) ); r = (im_src->red[c1] + im_src->red[c2] + im_src->red[c3] + im_src->red[c4]) / 4; g = (im_src->green[c1] + im_src->green[c2] + im_src->green[c3] + im_src->green[c4]) / 4; b = (im_src->blue[c1] + im_src->blue[c2] + im_src->blue[c3] + im_src->blue[c4]) / 4; color=gdImageColorClosest(im_dst,r,g,b); gdImageSetPixel( im_dst, (i+dstX),(j+dstY), color ); }; }; RETURN_TRUE; } #endif /* HAVE_LIBGD */ http://www.php.net/manual/en/function.imagecopyresized.php